US4922784A - Detent device for a control lever - Google Patents

Detent device for a control lever Download PDF

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Publication number
US4922784A
US4922784A US07/318,003 US31800389A US4922784A US 4922784 A US4922784 A US 4922784A US 31800389 A US31800389 A US 31800389A US 4922784 A US4922784 A US 4922784A
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US
United States
Prior art keywords
piston
cam
detent
control lever
pressure chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/318,003
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English (en)
Inventor
Sachio Hidaka
Yoshiaki Fujimoto
Takao Tani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Assigned to KABUSHIKI KAISHA KOBE SEIKO SHO reassignment KABUSHIKI KAISHA KOBE SEIKO SHO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FUJIMOTO, YOSHIAKI, HIDAKA, SACHIO, TANI, TAKAO
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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B21/00—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
    • A63B21/02—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices using resilient force-resisters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/52—Details of compartments for driving engines or motors or of operator's stands or cabins
    • B66C13/54—Operator's stands or cabins
    • B66C13/56—Arrangements of handles or pedals
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B5/00—Apparatus for jumping
    • A63B5/20—Skipping-ropes or similar devices rotating in a vertical plane
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/06—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G2009/04766—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks providing feel, e.g. indexing means, means to create counterforce
    • G05G2009/0477—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks providing feel, e.g. indexing means, means to create counterforce holding the member in a number of definite positions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20636—Detents

Definitions

  • the present invention relates to a detent device for maintaining a control lever at an operating position which issues a command of a winding-up or other to a winch of a crane or the like.
  • FIG. 6 As a conventional detent device for a control lever, the device shown in FIG. 6 is well known.
  • the well known example shows the case where the device is applied to a so-called remote control valve in which a pilot reducing valve is actuated by operation of a lever.
  • the reference numeral 1 designates a control lever, and 2 is a cam secured to the control lever 1, these being integrally rotated around a horizontal shaft 3.
  • Push rods 4a and 5a of pilot reducing valves 4 and 5 come into contact with the bottom surface of the cam 2 so that one of the reducing valves 4 and 5 is actuated by rotation of the cam 2 and a main control valve not shown is switched by the secondary pressure thereof and the winding-up or winding-down operation is carried out.
  • Both sides 2a, 2a (hereinafter referred to as cam surfaces) of the cam 2 are provided with detent recesses 6 . . . at two locations corresponding to operating positions (detent positions) on both sides of the lever.
  • a piston case 8 is provided on a housing 7 housing therein the cam 2, the piston case 8 being interiorly provided with a piston 9 and a bias spring 10 for biasing the piston 9 toward the cam surface 2a.
  • a ball 11 in elastic contact with the cam surface 2a is held on the end of the piston 9, and at the detent position. The ball 11 is engaged with the recess 6 of the cam 2 whereby the cam 2, that is the control lever is held at the detent position against the spring reaction of the reducing valves 4 or 5.
  • a detent device for a control lever comprising a cam which moves integral with a control lever by operation of the control lever, a piston mounted such that the end thereof comes into sliding contact with the cam by movement of said cam, a pressure chamber formed so as to communicate with an end of said piston, opposite the sliding surface, and a spring provided within said pressure chamber to bias said piston toward said cam, wherein said cam is provided with a detent portion in a part of the surface with which the end of said piston sliding contacts said detent portion and wherein the sliding resistance with the end of the piston is greater at the detent position of the control lever, than elsewhere detection means are provided for detecting that the end of the piston is positioned at said detent portion, and oil-pressure supply means are provided for supplying oil pressure to said pressure chamber on the basis of a detection signal from said detection means.
  • an electric contact constituted by the piston and the cam is used as the detection means.
  • the detent resistance can be reduced in the portion other than the detent position, and therefore, the operability can be improved, and the proportion of the detent resistance occupied by the entire operating reaction can be reduced, that is, the proportion occupied by the load reaction can be increased to positively transmit the load reaction to the driver.
  • the detection means an electric contact constituted by the piston and the cam is used, whereby the mounting adjustment of the detection means need not be required, and therefore introduction work becomes easy. Furthermore, since influence due to the vibration of a machine body is hardly received, the reliability of the detecting operation is improved.
  • FIG. 1 is a view showing a first embodiment according to the present invention
  • FIGS. 2(a) and 2(b) are circuit views showing two examples of a drive circuit for a solenoid of an electromagnetic switching valve in the device shown in FIG. 1;
  • FIG. 3 is a view showing a second embodiment according to the present invention.
  • FIG. 4 is a view showing a third embodiment according to the present invention.
  • FIG. 5 is a view corresponding to FIG. 1 showing a fourth embodiment of the present invention.
  • FIG. 6 is a view showing a prior art.
  • FIGS. 1 and 2 show a first embodiment of the present invention
  • FIG. 3 shows a second embodiment
  • FIG. 4 shows a third embodiment
  • FIG. 5 shows a fourth embodiment.
  • a control lever for a winch controlling remote control valve similarly to the above-described prior art.
  • the reference numeral 21 designates a cam which is rotated around a horizontal shaft 22 integral with a control lever identical to control lever 1 of FIG. 6 by operation of the control lever.
  • Recesses 23, 23 as detent portions are provided at upper and lower locations corresponding to operating positions (detent positions) on both sides of the lever in the side (hereinafter referred to the detent position) 21a of the cam 21.
  • a piston case 25 is mounted on a housing 24 housing therein the cam 21, the piston case 25 being interiorly provided with a piston 26 and a push spring 27 for biasing the piston 26 toward the cam surface 21a.
  • the reference numeral 28 designates a combination spring receive-cap mounted on the rear end of the piston case 25, and a pressure chamber 29 is formed between the cap 28 and the piston 26 within the piston case 25.
  • a ball 30 is held on the end of the piston 26, the ball 30 being elastically placed in contact with the cam surface 21a by the force of the push spring 27 and placed in engagement with the recess 23 at the detent position.
  • the force of the push spring 27 has the minimum magnitude as required such that the contact state between the ball 30 and the cam surface 21a is secured through the entire lever stroke and is set to be so weak that the cam 21 (control lever) cannot be held by itself in the state wherein the ball 30 is engaged with the recess 23.
  • a rod 31 is integrally connected to the rear end of the piston 26 in the state wherein the rod 31 extends through the cap 28.
  • a limit switch 32 is operated by the rod 31.
  • a hydraulic pump indicated at 33 is connected to the pressure chamber 29 within the piston case 25 through an electromagnetic switching valve 34 and a pipe 35.
  • the electromagnetic switching valve 34 In the state wherein a solenoid 34a is not energized, the electromagnetic switching valve 34 is at a tank communication position a on the left side in the figure, and when the limit switch 32 is actuated, the solenoid 34a is energized and switched to a pressure oil supply position b on the right side in the figure. In this state, pressure oil is supplied from the pump 33 to the pressure chamber 29 whereby oil pressure acts on the pressure chamber 29.
  • the reference numeral 36 designates a relief valve for setting pressure of the pressure chamber 29.
  • the detent is released by cutting off the energization of the electromagnetic switching valve 34 to the solenoid 34a through the operation of the release switch separately provided.
  • FIGS. 2(a) and 2(b) Two examples of the circuit structure of the solenoid drive circuit are shown in FIGS. 2(a) and 2(b).
  • a first relay 37 and a second relay 38 are used.
  • a normally open contact 39 of the first relay 37 and the solenoid 34a, the first relay 37 and a normally closed contact 40 of the second relay 38 and the limit switch 32, and the second relay 38 and a release switch 41 are respectively connected in series, these three series circuits being connected in parallel between power sources.
  • the limit switch when at the detent position, the limit switch is turned on, the first relay 37 is actuated to energize the solenoid 34a, and the electromagnetic valve 34 is switched to the pressure oil supply position b and is actuated. Thereafter, when the release switch 41 is turned on, the second relay 38 is actuated with the result that the normally closed contact 40 is opened and the first relay 37 is returned. Then, the normally open contact 39 is opened so that the energizing circuit of the solenoid 34a is cut off.
  • a normally closed switch is used as the limit switch 32.
  • the limit switch 32 is connected parallel with the release switch 41, and this parallel circuit is connected in series with the relay 42.
  • a normally closed contact 43 of the relay 42 and the solenoid 34a are connected in series between power sources.
  • the limit switch 32 is a normally closed switch
  • the relay 42 is in the operating state at a position other than the detent position, and the normally closed contact 43 thereof is opened so that the solenoid 34a is disconnected.
  • the limit switch 32 is then turned off by movement of the rod 31 in FIG. 1 at the detent position, and the relay 42 is returned and the normally closed contact 43 is closed to form an energizing circuit of the solenoid 34a.
  • the release switch 41 is turned on, the energization of the solenoid 34a is cut off.
  • FIG. 2(b) structure is simple.
  • the structure (a) is somewhat complicated, at the time of failure such as breaking of the wire to the relays 37 and 38, the detent function is merely eliminated. There is no inconvenience such that the detent function remaining effective, and a fail-safe function results.
  • the release switch 41 in FIG. 2 must be operated for every lever operation.
  • an electromagnetic switching valve 44 is provided in a pipe 35 connecting the electromagnetic switching valve 34 and the pressure chamber 29, the electromagnetic switching valve 44 being controlled by a selection switch not shown. In this manner, if the electromagnetic switching valve 44 is set to the tank communication position in the figure when the detent function is not needed, the detent function can be eliminated at all times. Therefore, it is possible to save the trouble of operating the release switch 41 for every lever operation.
  • a proximity switch or a photo sensor may be used in place of the limit switch 32.
  • the amount of movement of the ball 30, that is, the stroke of movement of the piston 26 is normally as small as 0.5 mm to 1 mm. Therefore, in the case of the structure of the aforementioned first and second embodiments in which the engagement of the ball 30 with the recess 23 has to be detected by a small stroke variation of the piston 26, mounting adjustment of the sensor (limit switch 32 or proximity switch or photo sensor) becomes cumbersome. In addition, there possibly occurs a deviation in adjustment due to the vibration of the body during operation.
  • the recess 23 may be deepened to increase the stroke of the piston 26.
  • the force required to disengage the ball 30 from the recess 23, that is, the detent releasing force increases and therefore the operability becomes deteriorated.
  • the movement of the piston 26 is not detected but an electric contact is constituted by the piston 26 and the cam 21 so that the engagement and disengagement between the ball 30 and the recess 23 are directly detected by opening and closing the contact.
  • the piston case 25 is formed of ceramic such as aluminum oxide or rubber or other electric insulating material and other constituent members are formed of electrically conductive material to thereby constitute a series circuit of the cap 28 of the piston case 25--push spring 27--piston 26--ball 30--cam 21--horizontal shaft 22 as a fulcrum of cam housing 24 on which the horizontal shaft 22 is mounted (the body being grounded).
  • This series circuit is connected to a power source (battery) 46 through a relay 45, and a normally closed contact 47 of the relay 45 is inserted into an energizing circuit of the electromagnetic switching valve 34 to the solenoid 34a.
  • An insulating layer 48 formed of electric insulating material similar to the piston case 25 is provided on the surface in contact with the ball 30 of the recess 23.
  • the rod 31 in the first and second embodiments is not needed.
  • the relay 45 In the contact-on state, the relay 45 is energized and actuated, and the normally closed contact 47 is opened. Therefore, the energizing circuit of the solenoid 34a is cut off. Accordingly, since the electromagnetic switching valve 34 is in the tank communication position a, oil pressure is not supplied to the pressure chamber 29.
  • the structure is reversed as compared to that of the third embodiment.
  • the cam 21 in addition to the piston case 25 is formed of electric insulating material
  • an electric conductive layer 49 formed of an electric conductive material is provided on the contact surface of the recess 23 with the ball 30, and the electric conductive layer 49 and the horizontal shaft 22 are connected by a lead wire 50 disposed within the cam 21.
  • a normally open contact 51 of the relay 45 is inserted into an energizing circuit of the electromagnetic switching valve 34 to the solenoid 34a.
  • the third and fourth embodiments have the structure wherein the electric contact is constituted by the piston 26 and the cam 21 and the electromagnetic switching valve 34 is controlled by opening and closing the contact. Therefore, cumbersome adjustment such as mounting adjustment of the sensor as in the case of the first and second embodiments in which the movement of the piston 26 is detected by the sensor is not needed. There is no problem of a deviation of adjustment due to the vibration of the body, and the reliability of detection is improved.
  • the recess 23 as a detent portion is provided on the side of the cam 21, and the ball 30 is provided on the side of the piston 26 opposed to the former, it is noted that, conversely thereto, a ball or a ball-like projection as a detent portion may be provided on the cam side, and a recess with which the projection is engaged may be provided on the piston side.
  • the electric contact constituted by the piston and the cam is used as detection means
  • the electric contact is not always constituted by the projection and the recess as in the above-described third and fourth embodiments.
  • a stopper which comes into abutment with the piston to impede further rotation of the cam or a roughened portion for causing the frictional contact resistance of the piston to increase may be provided.
  • the detent resistance at a portion other than the detent position can be minimized. Because of this, the operability can be improved.
  • the proportion of the detent resistance occupied by the entire operating reaction can be made small, that is, the proportion for which the load reaction is occupied can be made large to positively transmit the load reaction to the driver.
  • the mounting adjustment of the detection means need not be required as compared with the case where the control lever having reached the detent position is detected by the movement of the piston, and therefore assembly becomes easy. Since the influence due to the vibration of the body hardly affects performance, the reliability of the detecting operation is improved.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Mechanical Control Devices (AREA)
US07/318,003 1988-03-03 1989-03-02 Detent device for a control lever Expired - Fee Related US4922784A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP63-28561 1988-03-03
JP2856188 1988-03-03
JP63-147954 1988-11-11
JP14795488 1988-11-11

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US4922784A true US4922784A (en) 1990-05-08

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US07/318,003 Expired - Fee Related US4922784A (en) 1988-03-03 1989-03-02 Detent device for a control lever

Country Status (5)

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US (1) US4922784A (de)
EP (1) EP0331176B1 (de)
KR (1) KR910006888Y1 (de)
DE (1) DE68904212T2 (de)
ES (1) ES2037892T3 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058451A (en) * 1988-11-11 1991-10-22 Kabushiki Kaisha Kobe Seiko Sho Control lever apparatus and actuator operation apparatus
US5156065A (en) * 1988-11-11 1992-10-20 Kabushiki Kaisha Kobe Seiko Sho Control lever apparatus and actuator operation apparatus
US5243921A (en) * 1991-08-28 1993-09-14 Oliver Products Company Adjustable table base
DE4421534A1 (de) * 1994-06-20 1995-12-21 Schaeffler Waelzlager Kg Rastvorrichtung
US6634383B2 (en) 2001-12-14 2003-10-21 Caterpillar Inc. Magnetic detent assist assembly
US20040112162A1 (en) * 2001-02-02 2004-06-17 Bengt Hermanson Centering device for longitudinal elements and a resetting device for motor vehicles
CN110847148A (zh) * 2019-11-12 2020-02-28 湖南博邦重工有限公司 一种强夯机夯锤起停控制系统

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284910A (en) * 1964-01-20 1966-11-15 Western Electric Co Test probe for detecting misalignment of metal workpieces
US3414879A (en) * 1965-07-15 1968-12-03 Pharmaceutical Plastics Ltd Advance brake warning devices for road vehicles
US4107492A (en) * 1976-05-05 1978-08-15 Robertshaw Controls Company Pneumatic operated switch having movable flag, switch actuator mounted thereon, and switch in chamber displaced from measured flow path
US4163970A (en) * 1975-05-23 1979-08-07 Allinquant F M Pneumatic springs and other telescopic systems
US4381507A (en) * 1981-10-27 1983-04-26 D. E. McCraw, Jr. Fluid cylinder positional indicator and method
US4542373A (en) * 1983-09-12 1985-09-17 Hillock Edward E Small craft plug detector
DE3413423A1 (de) * 1984-04-10 1985-10-17 Blöchle, Walter, 7200 Tuttlingen Optischer - naehrungsschalter
US4558312A (en) * 1982-03-05 1985-12-10 Sony Magnescale Incorporated Position detecting device
US4799048A (en) * 1984-09-28 1989-01-17 Nippondenso Co., Ltd. Accumulator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339987A (en) * 1980-11-03 1982-07-20 Deere & Company Pressure detent mechanism

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284910A (en) * 1964-01-20 1966-11-15 Western Electric Co Test probe for detecting misalignment of metal workpieces
US3414879A (en) * 1965-07-15 1968-12-03 Pharmaceutical Plastics Ltd Advance brake warning devices for road vehicles
US4163970A (en) * 1975-05-23 1979-08-07 Allinquant F M Pneumatic springs and other telescopic systems
US4107492A (en) * 1976-05-05 1978-08-15 Robertshaw Controls Company Pneumatic operated switch having movable flag, switch actuator mounted thereon, and switch in chamber displaced from measured flow path
US4381507A (en) * 1981-10-27 1983-04-26 D. E. McCraw, Jr. Fluid cylinder positional indicator and method
US4558312A (en) * 1982-03-05 1985-12-10 Sony Magnescale Incorporated Position detecting device
US4542373A (en) * 1983-09-12 1985-09-17 Hillock Edward E Small craft plug detector
DE3413423A1 (de) * 1984-04-10 1985-10-17 Blöchle, Walter, 7200 Tuttlingen Optischer - naehrungsschalter
US4799048A (en) * 1984-09-28 1989-01-17 Nippondenso Co., Ltd. Accumulator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058451A (en) * 1988-11-11 1991-10-22 Kabushiki Kaisha Kobe Seiko Sho Control lever apparatus and actuator operation apparatus
US5156065A (en) * 1988-11-11 1992-10-20 Kabushiki Kaisha Kobe Seiko Sho Control lever apparatus and actuator operation apparatus
US5243921A (en) * 1991-08-28 1993-09-14 Oliver Products Company Adjustable table base
DE4421534A1 (de) * 1994-06-20 1995-12-21 Schaeffler Waelzlager Kg Rastvorrichtung
US20040112162A1 (en) * 2001-02-02 2004-06-17 Bengt Hermanson Centering device for longitudinal elements and a resetting device for motor vehicles
US7246538B2 (en) * 2001-02-02 2007-07-24 Kongsberg Automotive Ab Centering device for longitudinal elements and a resetting device for motor vehicles
US6634383B2 (en) 2001-12-14 2003-10-21 Caterpillar Inc. Magnetic detent assist assembly
CN110847148A (zh) * 2019-11-12 2020-02-28 湖南博邦重工有限公司 一种强夯机夯锤起停控制系统

Also Published As

Publication number Publication date
EP0331176B1 (de) 1993-01-07
DE68904212D1 (de) 1993-02-18
DE68904212T2 (de) 1993-05-06
KR910006888Y1 (ko) 1991-09-16
ES2037892T3 (es) 1993-07-01
KR890019247U (ko) 1989-10-05
EP0331176A1 (de) 1989-09-06

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